<template>
  <div>
    <el-form
        v-loading="loading"
        element-loading-text="正在登录......"
        element-loading-spinner="el-icon-loading"
        element-loading-background="rgba(0, 0, 0, 0.8)"
        ref="loginForm" :model="loginForm" :rules="rules" class="loginContainer">
      <h3 class="loginTitle">系统登录</h3>
      <!-- 自动补全 auto-complete="false" -->
      <el-form-item prop="username">
        <el-input type="text" auto-complete="false" v-model="loginForm.username" placeholder="请输入用户名"></el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input type="password" auto-complete="false" v-model="loginForm.password" placeholder="请输入密码"></el-input>
      </el-form-item>
      <el-form-item prop="code">
        <el-input type="text" auto-complete="false" v-model="loginForm.code" placeholder="点击图片更换验证码"
                  style="width: 250px;margin-right: 5px;"></el-input>
        <img :src="captchaUrl" @click="updateCaptcha">
      </el-form-item>
      <el-checkbox v-model="checked" class="loginRemember">记住我</el-checkbox>
      <el-button type="primary" style="width: 100%" @click="submitLogin">登录</el-button>
    </el-form>
  </div>
</template>
<script>
export default {
  name: 'Login',
  components: {},
  props: [],
  data() {
    return {
      // 验证码
      captchaUrl: '/captcha?time=' + new Date(),
      loginForm: {
        username: 'admin',
        password: '123',
        code: '',
      },
      loading: false, // 加载中
      checked: true,
      rules: {
        username: [{required: true, message: '请输入用户名', trigger: 'blur'}],
        password: [{required: true, message: '请输入密码', trigger: 'blur'}],
        code: [{required: true, message: '请输入验证码', trigger: 'blur'}]
      }
    }
  },
  methods: {
    // 点击刷新验证码
    updateCaptcha() {
      this.captchaUrl = '/captcha?time=' + new Date()
    },
    submitLogin() {
      // 登录
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          this.loading = true
          // alert('submit!')
          this.postRequest('/login', this.loginForm).then(resp => {
            // alert(JSON.stringify(resp));
            this.loading = false
            if (resp) {
              // 存储用户 token 到 sessionStorage
              const tokenStr = resp.obj.tokenHead + resp.obj.token
              window.sessionStorage.setItem('tokenStr', tokenStr)
              // 跳转到首页
              // this.$router.push('/home') // 路由跳转，可以回退到上一页
              // this.$router.replace('/home') // 路径替换，无法回退到上一页

              // 页面跳转
              // 拿到用户要跳转的路径
              let path = this.$route.query.redirect;
              // 用户可能输入首页地址或错误地址，让他跳到首页，否则跳转到他输入的地址
              this.$router.replace((path === '/' || path === undefined) ? '/home' : path)
            }

          })
        } else {
          this.$message.error('请输入所有字段！')
          return false;
        }
      })
    }
  }
}
</script>
<style>
.loginContainer {
  border-radius: 15px;
  background-clip: padding-box;
  /*属性规定背景的绘制区域 背景被裁剪到内边距框。 margin: 180 px auto;*/
  margin: 180px auto;
  width: 350px;
  padding: 15px 35px;
  background: #fff;
  border: 1px solid #eaeaea;
  box-shadow: 0 0 25px #cac6c6;
}

.loginTitle {
  margin: 0 auto 40px auto;
  text-align: center;
}

.loginRemember {
  text-align: left;
  margin: 0 0 15px 0;
}

/*验证码*/
.el-form-item__content {
  display: flex;
  align-items: center;
}
</style>
